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Category: Work

#userdrivendesign Prosthetic arm design: i-Limb Revolution versus customized body powered arm in a work environment combining bodily exertion, wide temperature ranges, wide body motion ranges, heavy workload and subtle grips [Cybathlon Symposium, Oct 6 2016, Poster A12]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - #userdrivendesign Prosthetic arm design: i-Limb Revolution versus customized body powered arm in a work environment combining bodily exertion, wide temperature ranges, wide body motion ranges, heavy workload and subtle grips [Cybathlon Symposium, Oct 6 2016, Poster A12]; published October 2, 2016, 13:05; URL: https://www.swisswuff.ch/tech/?p=6342.

BibTeX: @MISC{schweitzer_wolf_1571329852, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - #userdrivendesign Prosthetic arm design: i-Limb Revolution versus customized body powered arm in a work environment combining bodily exertion, wide temperature ranges, wide body motion ranges, heavy workload and subtle grips [Cybathlon Symposium, Oct 6 2016, Poster A12]}}, month = {October},year = {2016}, url = {https://www.swisswuff.ch/tech/?p=6342}}


PDF of poster presentation @ Cybathlon Symposium Oct 06 2016 @ Kloten.

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Behindertenwitz #frankwormuth #deutscherfussball #yassine

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Behindertenwitz #frankwormuth #deutscherfussball #yassine; published January 24, 2014, 13:33; URL: https://www.swisswuff.ch/tech/?p=2702.

BibTeX: @MISC{schweitzer_wolf_1571329852, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Behindertenwitz #frankwormuth #deutscherfussball #yassine}}, month = {January},year = {2014}, url = {https://www.swisswuff.ch/tech/?p=2702}}


Der geistig offenbar nun doch deutlich jenseits seiner Grenze tätige deutscher Fussballtrainer Frank Wormuth weist offenbar folgenden Zeitverlauf in seiner Karriere auf:

  • Ein einziges Tor soll er ein seiner Zeit als Profispieler gespielt haben [Wikipedia].
  • Am 1. Januar 2008 wird Frank Wormuth Cheftrainer des DFB [Wikipedia].

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Chinese farmer makes functional affordable prosthetic arms [amputee driven innovation]

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Chinese farmer makes functional affordable prosthetic arms [amputee driven innovation]; published May 27, 2013, 04:42; URL: https://www.swisswuff.ch/tech/?p=1686.

BibTeX: @MISC{schweitzer_wolf_1571329852, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Chinese farmer makes functional affordable prosthetic arms [amputee driven innovation]}}, month = {May},year = {2013}, url = {https://www.swisswuff.ch/tech/?p=1686}}


The previously announced abandonment of any mechanical and body powered type of prosthetic arms and hands by major manufacturers has now found new suppliers.

It appears that on the planet that real workers live on (not the chee chee froo froo world where carbon yacht fan Max Näder reams insurances with Michelangelo ""bionic"" hands) amputees drive innovation - not Centri, Hosmer, RSL Steeper, Touch Bionics or Otto Bock. They would have mechanical drafts they could most easily use to build useful nice looking body powered hands. It is just not what they do. So that is where us amputees come in.

Latest video of a Chinese farmer. Very impressive.

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Bill Clinton speaks at CDI opening ceremony at HSG

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Bill Clinton speaks at CDI opening ceremony at HSG; published November 6, 2009, 00:55; URL: https://www.swisswuff.ch/tech/?p=236.

BibTeX: @MISC{schweitzer_wolf_1571329852, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Bill Clinton speaks at CDI opening ceremony at HSG}}, month = {November},year = {2009}, url = {https://www.swisswuff.ch/tech/?p=236}}


The University St Gallen and the MyHandicap Foundation opened their Center for Disability Integration today, November 5th. Bill Clinton spoke at he opening ceremony.

What do they write they do?

  • They investigate how mental illness affects coworkers.
  • They investigate how to reduce public spending on disabled people.
  • They somehow hope to integrate disabled people into society.

Sounds interesting.

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Otto Bock Michelangelo hand

Cite this article:
Wolf Schweitzer: Technical Below Elbow Amputee Issues - Otto Bock Michelangelo hand; published March 27, 2009, 00:32; URL: https://www.swisswuff.ch/tech/?p=145.

BibTeX: @MISC{schweitzer_wolf_1571329852, author = {Wolf Schweitzer}, title = {{Technical Below Elbow Amputee Issues - Otto Bock Michelangelo hand}}, month = {March},year = {2009}, url = {https://www.swisswuff.ch/tech/?p=145}}


5 Comments

[Find all articles about the Otto Bock Michelangelo hand]

While I am still busy lining up comparative benchmark type manipulations to compare iLimb and cable controlled prosthetics and considering artistic aspects of prosthetics, the new 2010 model of Otto Bock's Michelangelo hand apparently featuring 'biomimicry' (i.e., their version of the iLimb) can be seen already on video.

More recently seen, the OT Leipzig 2010 version looks disappointing in comparison. Probably we see the same phenomenon as in the car industry: gorgeous concept cars or advertising prosthesis - and no thrill afterwards.  I also attended a local live demo in May 2011 that seemed to subdue too exuberant initial expectations.

In trying to be 'bionic' (whatever the precise definition of that term may be), there are also other interesting projects such as the RAPHaEL hand or works done with Alejandro Hernandez Arieta at the AI Lab of the University of Zuerich. Related products seem to be the DEKA arm and the iLimb and the very similar looking BeBionic hand. Currently, research and development works towards multifinger and complex motion control rather than the two-electrode control that myoelectric hands have since the fifties.

The iLimb, BeBionic and Michelangelo hand:

  • are not at all thought-controlled (as awkward advertising hype may suggest)
  • look cool, but obviously any hand can be tweaked to also look cool
  • are restricted to myoelectric arms / sockets
  • only use two electrodes (open/close/switch) rather than currently emerging complex control paradigms
  • may deplete batteries rather quickly
  • are extremely/prohibitively expensive
  • offer limited grasp/lift options
  • seem to have significant delay (as other myoelectric arms)
  • emit irritating motor hissing sounds and are really noisy and loud
  • do not look good with cosmetic gloves on

Now, what immediately catches my eye in the Michelangelo hand videos is what appears to me to be a rather significant time lag between the moment a grip or hand movement seems to be in order and until it is actually done. I have started to investigate the subject of myoelectric prostheses and time lags a bit further even though maybe one day we will see mind control. It appears that these time lags are inherent to myoelectric control and so cable control wins.

Yes, of course - mind control! - "Only once I can use mind control, why the clumsy interface?" (Wolf Schweitzer, commenting on the Michelangelo hand, 2009)

As the Michelangelo hand is neither available, nor guaranteed to be affordable at all, nor is there any indication that it will work comfortably on a rather long stump such as mine given my problems I had so far using myoelectric technology I decided that a responsive and fast, sufficiently complex and cool hand does not necessarily have to be electric. Au contraire :-)

Meet my Becker Lock Grip Hand. It features an adaptive grip, particularly precise cable control, full manufacturer warranty and the option of getting a custom model made - also I went artistic with it and turned it into another Red Hand. It even solves difficult gripping problems that are probably way beyond these very modern gadgets. See my benchmark demos for handling eggs or picking grapes. This must be the ultimate proficiency test.

Copyright Otto Bock.

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